Time for Three will appear July 8 and 9 at the Colorado Music Festival.

A special on-line pre-sale begins today for single tickets to the Colorado Music Festival, which takes place June 26 through Aug. 6 in Boulder. This promotion gives on-line ticket purchasers a headstart on the best seats, because in-person and phone sales do not begin until May 10.

The festival’s line-up is an especially good one this summer, with such big names as pianist Peter Serkin (July 11) and soprano Jane Eaglen (July 29) and boundary-busting performers like Zoe Keating on “avant cello” (Aug. 3) and Time for Three (July 8 and 9), which combines elements of classical, country western, gypsy and jazz idioms.